Rock-drill.



D. S. WAUGH.

ROOK DRILL.

APPLIUATION PILBD APE.13,1914.

Patented Sept. I,29, 1914 W.. h, Ta n w .M M

NETE@ STATES PATENT FFCE.

DANIEL S. WAUGH, 0F EENVEB.. COLORADO. ASSIGNOR TO THE DENVER BOC-K DRILL MAEUFACTURING COMANY, OF DENVER, WARE.

CGLOBADQ, A CORPORATION 0F DELA- ROCKGDRILL.

Specification of Letters Patent.

Drignal snelle-.ation filed February 14,` 1914, Serial No. 818,644. Divided and this application filed April Serial No. 831,530.

rThe present invention relates to drilling apparatus ot the type employing expansive motive tluid'. and preferably. air as the actuating agency. ln this type of machine, the employment of pneumatic feeding means is well known. said 'feeding ineans Comprising a cylinder and a piston operating therein.y one being connected to the motor, the other haring a bea ring against the roel; v lt has also g or other supporting sui-tace. been eommon to provide a Clamp for one ot these members. 1While. this feeding means has proven sm; st'ul under certain cont itions, one ditliculty has been eneountered in that the machine can only be successfully resell i'or drilling holes in substantially one Q direction. That to say. a machine which will be held to its Werk tor drilling an uphole. heretofore has not been snecesstui tor drillinT down holes. rthis, it is believed.

will be. obi-irl .s `when it is Considered that l.

in drilling an upwardly extending hole, the

area of the teen piston must be sulicient to f Weight ot the machine in addi- 5 snpil'iort the taint( vresisting the blow ot' the tool against the ri i.. li'hen. therefore. the. machine is rewreed. to drill a don'ndiole. the Weight ol" ille gut the teelt piston causes the same to .it a pressure. lt is theretore lilla-ult. :t not iniposs Rock-Drills. of which the machine in addition to the pressureI` dile, to rotate the ma! l and the drill bit is aot to become stuck. l

oi' the pre-sent invention is to aaehine. in which this seriousl entirely over-Colne, and experiil will operate proven entirely satisfactory in actual operan l tion is disclosed in the accompanying drawl ings, whereinliigure l is a longitudinal sectional View i through the machine, and Fig. 2 is a detail sectional vien' through the rear portion ot' 1 the motor, illustrating the ports that control the supply of motive fluid to the front piston chamber in rear olf the enlarged piston head.

l tiimilar reference numerals designate corresponding parts in all the ligures of the drawings.

ln the embodiment, disclosed, 'the motor l numeral 3, and the feeding means in like manner is designated l. lhe motor is of l the valveless" type. and comprises a cyll inder member 5 haring a t'ront eliambcr (l l and a rear chamber T, the latter being ot l less diameter than the chamber t3, and being l loi-med in a plug S, suitably located in the rear portion of the cylinder member and l held in place by a rear head block J that engages a iiange l() formed upon the plrg l tl, this tiange i() being conined l-,eta'een the head bloeli Sl and the rear end oi' the cylinder member if. front head bloeli ll has suitl ably seemed therein a ehueli sleeve i12 that loosely receives the usual drill bit ii-5, and located in said head bloelt ll in rear of the chuck sleeve 12, is a tapjviet il.

reeiproeatory hammer piston operates in the cylinder member and comprises a l'ront head i5 operating in the piston chain ber (S and ay rear smaller elongated head lb that operates in the rear chamber T. rliese i two heads are connected by a reduced neck .l portion 'itl forming an annular groove il). l is a result ot this construction, the piston l has two separate rear pressure areas, one ot' n'hieh is designated 20, the other being designated 2l, the said piston also having a .front pressure area Q9., which is equal to the Combined areas1 LO and 2l.

'lhe rear head block 9 has a rearwardly extending externally tapered extension and said head block and extension have formed therein a motive fluid chamber 2l is in Constant communication with the .aller piston chamber "l". -Forined in the l prag and connroinicating with the chainis designated generally by the reference.

ber 24, are supply ports 25 that vopenthrough the side walls of the smaller piston chamber 7, and are thus controlled by the piston head 16. Another supply passage 26 also opens throughv the side walls of the piston chamber 7, as illustrated at 27, and said passage leads to the front end of the forward piston chamber 6, in advance of the head l5, the port being designated 28. An exhaust passage 29 is formed in one side of the cylinder member 5, and communicates with an annular groove 30 formed in the wall of the enlarged front piston chamber 6, the head 15 passing on opposite sides of the groove, and thus permitting the alternate exhaust from the chamber 6 on opposite sides of the piston head 15.

The feeding means 4, in the present embodiment, consists of a cylinder member 31, within which operates a piston vmember comprising a head 32 carried by a tubular piston rod 33 and having a packing cup 3-1 that is held to said head by a washer 35 and a plug 36 extending through the Washer and threaded into the head. The tubular piston rod 33 has a Lflared front end 37 that fits upon the tapered extension 23 of the head block t), and surrounding this flared end is a collar 38 held in place by side bolts 89 passing therethrough, said side bolts connecting the collar :38 with the front head l1, and thus serving to hold all the parts in assembled relation. The head 32 of the feed piston, the packing'cup 34 and the washer :l5 are pro\ided with passageways 40 that atl'ord conmiunieation from thc rear of the leed piston through the same with the interior of the piston rod 33. Motive fluid supplied from any suitable source is connected hy a hose or conduit with a nipple All attached to the rear head 42 of the feed cylindeinand this motive lluid will thus act against the rear end of the 'feed piston, and passing through the passageways 40 and feed piston rod 32S. will enter 'the chamber 2l'. thel rear end ol" the extension 23 having suitable ports 43 to permit such passage.

lrictly described. the operation is as lollows 1-Iilotive lluid supplied through the nipple +1 will operateagainst the feed pistcnjand torre it forwardly in the feed cyliuder..l l`his, it is, thought, will be clear when it is considered thtithe plug 36 moves with the leed'pistou and the motive fluid acting againsttlie same, will press it forward, there-hy allowing such motive fluid to gain access to and pass freely 'through the passages 40 in the feed piston. Therefore il the rear cud oi said feed cylinder which is in the toriu of a spul" -l-l is placed against a bearing or support. the motor will be advanced to its work. l`he motive fluid, aS already explained, will enter theehamber 24. and there will thus he a constant pressure against the rear pressure surface 2O of the motor piston. Assuming the parts in the position shown in Fig. 1, motive fluid will also pass through the port 27, passageway 2G and port 28, thus operatine against the front pressure surface 22 and` driving the piston rearwardly. `Motive fluid in rear of the larger head 15 of the piston will exhaust through the port' 29 until said port is covered. As the piston moves rearwardly, the port 27 will be covered by the piston head 1G, and said piston will then be driven rearwardly under the expansion of the motive fluid in theft-ont portion'of the piston chamber t; against the pressure' against the rear surface 20. At the same time, as soon as the front head l5 covers the inner end of the exhaust. port 29, pressurewill begin to build uplehind the larger head 15, or in other words. against the rear pressure surface 21. The piston, however, moves rearwardly until. its reduced neck 18 or groove 19 uncovers the ports 25, whereupon the motive Huid, under pressure, will pass through these ports, around the groove 19, and into the rear portion ofthe piston chamber against the rear pressure surface 21. At this time, the enlarged head l5 has passed rearwardly to uncover the exhaust port 2S) in advance of the piston. Consequently the pistonwill immediately reverse and he driven forward on its working stroke. In this connection, with will he evident that there is constant pres- 'sure against the rear end of the feed piston,

but this' pressure is being lieved and augmented by the action of the motor piston. As already explained, there is constant pressure against the area 20, and during the forward movement of the piston, this helps to overcome the forward presalternately resure against the feed piston.. Moreover during the forward movement of the motor piston, when the ports are open and the exhaust 2S) in advanceof the piston head l5v is open, the pressure against the rear surtaee 2l ol the piston and against the front taee of the plug` S tends to oppose the forward pressure of the feed' piston. On the otherdiand, when the return stroke takes place, there is, for an instant, a pressure against the front surfaee 22 of the motor pistonand against the rear face of thefront head hloek- 1l, while air is then exhausted in rear ol the piston head l5. This assists the feeding means to move the machine to its work. As a result of these quick actions,

this operation it` the. motor automaticallymercomes the presi sure of the `fecdingnieans for an instant on each stroke, and this relief is sufficient and is at the. proper time to. pertnitthemachine to he rotated freely and yell it will he held to vits work properly, whether itis used for drilling upwardly or downwardly.

In this connection. it-will he noted also that,I a feeding piston. of relatively smaller diamel l5, but greater than the head 16.

therein and baviuff rear ressuri.

inder member, and means for s 'isopposed to the surface From the foregoing. it is thought that the construction, operation and many advantages of the herein deseribed invention will be apparent to those sltilied in the art, Q Without further description, and it n'ili be understood that various changes in the sizel shape, proportion and minor details of eonstruction may ne resorted to Without departl v'ing from the. spirit or sacrificing any of the l adiantages of the invention. i Haring thusfuliy described my ihrention, what claim as nenv and desire to sei eure by Letters Patent, iszl i l. 1n apparatus of the character set forth, the. combination with a motor, of feedingi means for the motor comprising a cylinder l member and a piston operatingv l being connected to the motor, and means; for supplying,r motive fluid to the feeding means, said motor comprising a eylinderi member having a rear pressure surface, piston operating in Athe Cylinder member and haring two rear pressure surfaces, one of which opposed to the surface of the Cyl- I ippi-ying motive iuid tothe motor and periodically introducing motive fluid between said opposed pressure surfaces of `,the. piston and cylinder membesr, and thereby producin an intermittent pressure resistance to the feeding means, said motive Huid supplying means maintaining a constant pressure against the other rea-r pressure surface of tbe piston. r ln apparatus of the character set forth, the combination `with a motor, of feeding means for the motor comprising a Cylinder member and a piston operating therein, one being Connected to the motor, and means for supplying motive fluid to the feeding means, said motor comprising a Cylinder member having a rear pressure surface, a piston therein, one

operating in the Cylinder member and having two rear pressure surfaces, one of which of the cylinder member, and means for supplying motive Huid t'o the motor and periodically introduring motive fluid between said opposed pressure surfaees of the piston and cylinder member, and thereby producing an intermitpressure resistance to the feeding nir-ans, said motive fluid supplying means maintaining' a roustaut pressure against the ollu-r rear pressure surizu'e of the piston, tbe rombined ar is of the roar pressure Surfaces of tbe motor piston being" greater than i (but if tbe feeding pistou.

I. in apparatus o' the cbararter set forth, (be combiualion u'itb a motor Compris-ing a orliiull-z member and a. piston operating l surfaces nl liil'eriut diameters, of feeding' meanSi connected to the motor and comprising a Cylinder and a piston operating in the cylinder, said feeding piston being of less area than the larger rear pressure surface of the motor piston, means for supplying motive iiuid to the feeding means and tothe motor, and means for distributing motive fluid to the motor piston to maintain aconst-ant pressure against one of the rear surfaces thereof and an intermittent pressure against the other.

in apparatus of the character set forth, the eonibination with a motor Comprising a cylinder member haring a rear pressure surface and a piston operating therein and having rear pressure surfaces of different diameters, one of which is opposed to the said cylinder pressure surface, of feeding means connected to the motor and comprising` a cylinder and a piston operating in the eyiinder, means for supplyingr motive iiuid to the feeding means and to the motor, and means for distributing' motive iiuid to the motor piston to maintain a constant pressure against one of the rear surfaces thereof and an intermittent pressure against the other and against the said Cylinder pressure surfae said pressure surfaces of the motor and the feed piston being so proportioned that the pressure 'against the said Combined motor surfaces intermittently produces suflieient counter-pressure to the pressure against the feed piston to relieve tbe pressure of the apparatus against the Work 1whereby said apparatus can be easily rotated.

in apparatus of the character set forli-b, the Combination with a Valveless mot fr,

"eomprising a cylinder member and a piston' operating therein and having rear pressure surfaces of dierent diameters, of feeding means Connected to the motor and compris ing a cylinder member and a piston member operating therein', the area of tbe feed piston being less than the combined rear pressure areas of the motor piston.

6. In apparatus of the character set forth, the Combination with a valveless motor, comprising,r a cylinder member and piston operating therein and having rear pressure surfaees of diii'erentdiameters, of feeding means connected to the motor and comprisinga cylinder-member and a piston member operating' therein, the area of the feedpiston being less than the combined Arear pressure arcas of the motor piston, and means for delivering motive luid under substantially the same pressure to both the feedingrl means and the motor.

T. in apparatus of the rbaraeter set forth, tbe rombination with a ralwliss motor, eoniprisiug a ryliiuinr uuiuber and g: piston member exwraliulo therein and baring separato rear pressure suri'zu'es vl' ll-ill'erent diameters nl feeding means eouuevied to tbe motor and comprising a cylinder member*l and a. Piston member operatin therein, the area o the feed piston being ess than the larger area. und greater than the smaller 5 area of the rear pressure surfaces of the Witnesses: i

motor piston. JAS. R. ELMENDORF,

In testimony whereof I have hereunto C. E. KAISER.

sei:` my hand in {iresen'c'e' of Itwo subscribing witnesses.

' DANIEL S. WAUGH. 

